- 4 Evergreen Valve
- ABB
- ABZ
- Acme
- Airmaster
- Alan Wire
- Allied Tube
- Anamet
- Anixter
- Anvil
- Apollo
- Appleton
- Austin
- Baldor
- Bergen-Paterson
- Bridgeport
- Brighton Best
- BWF
- C&C
- Cameron Distributive Valve
- Cameron/WKM
- Cantex
- Cerro-Wire
- Chalfant
- Chromalox
- Coleman Cable
- Conductix/Wampfler
- Cooper Arrowheart
- Cooper B-Line
- Cope
- Cox Reel
- Del Tech
- Dixon
- Donaldson
- Dwyer
- Edison
- Edwards Signal
- Electriflex
- Exit Flex F-E-T (Forum Energy Technologies)
- Fabricast
- Federal Pacific
- Federal Signal
- Flanders
- Gore
- Graco
- H&H Tube
- Hammond
- Holz Rubber
- Houston Wire and Cable
- Hubbell
- IFM Efector
- Kuriyama
- Lamons
- Liebher
- Matco-Norca
- Mercer Rubber
- Mersen (Ferraz Shawmut)
- Milwaukee
- Milwaukee
- Molex
- Mueller
- Nicholson
- O/Z Gedney
- Omni Cable
- Orbinox
- P and S
- Parker
- Parker Dayco
- Pass and Seymour Legrand
- Pepperl and Fuchs
- Poly-Corp
- Pro-Flow
- Proco Products
- Promag
- Reelcraft
- Rittal
- Shamrock Steel
- Sharpe
- Siemens
- Smith Blair
- Smith-Cooper
- Smith-Cooper
- Sola/Heavi-Duty
- Southwire
- Spence Engineering
- Spray Systems
- Sprecher & Schuh
- Stahlin
- Steam Systems
- Teadit
- Techno
- Techno Check
- Teco-Westinghouse
- Texas Flange
- Thomas and Betts
- TPI
- Tylok
- Unaflex
- Unistrut
- United Copper
- Weg
- Zepco